... this year. Monitoring, Control and Effects of Air Pollution 54 2 3 /%C O ai rRR 38 2000/ppmC H air RR 50/ppmHCHO air RR LaFeO 3 1. 03 1.00 1.80 La0.8Sr0.2FeO 3 0.89 1.07 ... Buccolieri, and D. Manno, , Sensors and Actuators B, vol. 145, p. 794, 2010. [37 ] P G. Su and T T. Pan, Mater. Chem. and Phys., vol. 125, p. 35 1, 2011. Monitoring, Control and Effects of Air Pollution ... [OC] 50 ppm 40 ppm 30 ppm 20 ppm 10 ppmSensitivity [RHCHO/R air ] Fig. 7. HCHO Gas-sensing properties of LaFeO 3 [17]. Monitoring, Control and Effects of Air Pollution 68 Fig....